"Koisuru Paranoia" is a song composed, sung, and illustrated by Hinata Haruhana. The song was first published on January 28th 2011. The song was later featured in the album "Mado to Hekimen no Accord", and the album version is later uploaded on August 12th 2014. It is Hinata Haruhana's first work in 2011, the previous being Domestic Canary, and it's later succeeded by Kokoro Shinryaku Robot.

A love song sung by Mizuki to Nishimori Sota. In the original video (not the album version) the video features Sota as well. The song is related to the story Kimi Hitori, and in the interval, has the melody of the song Kimi Hitori as well.